# 定义过滤方法，来过滤热门新闻显示颜色
from flask import session,current_app,g
from functools import wraps

def index_class(index):
    if index == 1:
        return "first"
    elif index == 2:
        return "second"
    elif index == 3:
        return "third"
    else:
        return ""


# 封装用户登录数据
def user_login_data(view_func):
    @wraps(view_func)
    def wrapper(*args,**kwargs):
        # 获取用户登录状态,取session的值用get方法，不会发生错误
        user_id = session.get("user_id")

        user = None
        from info.models import User
        if user_id:
            try:
                # 获取用户登录数据
                user = User.query.get(user_id)
            except Exception as e:
                current_app.logger.error(e)
        # 使用g对象保存用户数据
        g.user = user

        return view_func(*args,**kwargs)
    return wrapper